Carbuncle's appearance may have been inspired by Carbuncle of the Final Fantasy series.

From March 29 to April 1, 2013, to celebrate Easter, Carbuncle is chosen as the Easter Bunny. Whenever a player draws a Carbuncle in the card pack, the player gets a Private Life Elixir. This applies up to the third Carbuncle drawn, so a player gets three Elixirs per day during the duration of the event.